Polyethylene resin composition and molded articles produced therefrom

A technology of polyethylene resin and composition, applied in the field of multimodal polyethylene resin composition, can solve the problems such as bending strength and fluidity, ESCR property, resistance to environmental stress cracking, low ESCR property, etc. Excellent long-term storage stability, high flexural strength, and high ESCR effect

Active Publication Date: 2020-06-26
HANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing polyethylene materials for bottle caps are excellent in bending strength or fluidity, the resistance to environmental stress cracking decreases, and there are limitations in application to carbonated beverage bottles, etc.
In KR10-0848526, WO2008 / 136849, and EP2017302B1 patents, a polyethylene resin composition was proposed to solve this problem, but the ESCR property was low, and a resin composition excellent in flexural strength, fluidity, and ESCR property could not be proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the continuous slurry polymerization method, two-stage polymerization is carried out by means of two polymerization tanks connected in series. The comonomer utilized was 1-butene. In the first polymerization tank, only ethylene was supplied as a monomer, and in the second polymerization tank, ethylene and 1-butene were supplied and polymerized.

[0039] The ethylene homopolymer (A) obtained in the first polymerization tank had a load of 2.16 kg and a melt flow index (first stage MI) at 190° C. of 850 g / 10 minutes. The ratio of (A) (Blend ratio ), B / R) is 60wt%, the ratio (100-B / R) of the copolymer (B) of ethylene and 1-butene obtained in the second polymerization tank is 40wt%, mixed with A and B resin combination The melt flow index (MI) of the product was 0.7, the MFRR was 138, and the density was 0.962. The resin composition obtained in Example 1 has an SFL of 77 cm, excellent high-speed processability, ESCR of 1,800 hours, excellent long-term storage stability ...

Embodiment 2

[0041] Polymers (A) and (B) were prepared in the same manner as in Example 1, and the ratio B / R of (A) in these polymers was changed to 63 wt%. The melt flow index (MI) was 1.8, the MFRR was 131, and the density was 0.958. The SFL of the resin composition obtained in Example 2 was 89 cm, so it was very excellent in high-speed processability. Although the ESCR was lower than Example 1, it was 1,100 hours, so it was possible to ensure long-term storage stability of carbonated beverage bottles, etc., and flexural strength 9,100kgf / cm 2 , thus showing favorable results for the lightweight of the bottle cap.

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PUM

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Abstract

The present invention relates to a multimodal polyethylene resin composition having excellent processability and bending strength and excellent environmental stress crack resistance (ESCR) when manufactured into a molded article, and a molded article produced therefrom. A polyethylene resin composition, the polyethylene resin composition comprising: at 2.16kg, the melt flow index at 190 ° C is 700g / 10 minutes to 1500g / 10 minutes () ethylene homopolymer (A) 60 weight % to 90% by weight; and 10% to 40% by weight of ethylene or α-olefin copolymer (B) with a carbon number of 3 to 20, the melt flow index of the polyethylene resin composition at 2.16kg at 190°C 0.6g to 2.0g / 10 minutes.

Description

technical field [0001] The present invention relates to a multimodal polyethylene resin composition having excellent processability and bending strength and excellent environmental stress crack resistance (ESCR) when manufactured into a molded article, and a molded article produced therefrom. Background technique [0002] Recently, plasticization of bottle cap materials used in beverage containers such as glass bottles and polyethylene terephthalate is increasing due to the diversification of packaging containers and the expansion of separate recycling from an environmental perspective. As plastic bottle cap materials, high-density polyethylene, polypropylene, etc. are mainly used, and bottle caps based on these materials are not only lighter, but also non-corrosive and excellent in formability compared to existing aluminum bottle caps. , and can realize molding of various designs, due to this advantage, its usage is increasing. In particular, high-density polyethylene has ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08J5/00C08L23/08C08L23/14C08L23/18
CPCC08J5/00C08L23/08C08L23/14C08L23/18C08L23/06C08L23/0815
Inventor金东镇李球炯
OwnerHANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD